Nimbus-6 earth radiation budget experiment

摘要: This paper describes the Nimbus-6 earth radiation budget experiment including its prelaunch calibration and in-flight performance. A preliminary assessment of data shows ERB measurement solar constant to be 1392 W/m2 which is 1.6% higher than expected value 1370 W/m2. Both values are traceable cavity radiometer scale. There a disagreement between fixed wide-angle scanning narrow-angle measurements planetary outgoing longwave flux. Since channels calibrated show good agreement with previous observations Nimbus-3 satellite, discrepancy believed due erroneous flux estimates. The estimates may caused by misinterpretation transfer function for wide-angle-earth-flux sensing thermopile detectors when viewing which, unlike source, does not fill field view detector an isotropic source. factor determined using procedure night-time channel as absolute standard. global albedoes, fluxes, net about 30%, 240 W/m2, −4 months July August 1975, in